64679989 has 8 divisors (see below), whose sum is σ = 71756640. Its totient is φ = 57802800.

The previous prime is 64679987. The next prime is 64679999. The reversal of 64679989 is 98997646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64679989 - 2¹ = 64679987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64679987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49182 + ... + 50479.

It is an arithmetic number, because the mean of its divisors is an integer number (8969580).

Almost surely, 2^64679989 is an apocalyptic number.

It is an amenable number.

64679989 is a deficient number, since it is larger than the sum of its proper divisors (7076651).

64679989 is a wasteful number, since it uses less digits than its factorization.

64679989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99731.

The product of its digits is 5878656, while the sum is 58.

The square root of 64679989 is about 8042.3870212767. The cubic root of 64679989 is about 401.4116559580.

The spelling of 64679989 in words is "sixty-four million, six hundred seventy-nine thousand, nine hundred eighty-nine".